<!DOCTYPE html>
<html ng-app="ngMap">
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<script src="script-tags-for-development.js"></script>
<script>
  var bounds = {
    17: [[20969, 20970], [50657, 50658]],
    18: [[41939, 41940], [101315, 101317]],
    19: [[83878, 83881], [202631, 202634]],
    20: [[167757, 167763], [405263, 405269]]
  };

  var imageMapType = new google.maps.ImageMapType({
    getTileUrl: function(coord, zoom) {
      if (zoom < 17 || zoom > 20 ||
          bounds[zoom][0][0] > coord.x || coord.x > bounds[zoom][0][1] ||
          bounds[zoom][1][0] > coord.y || coord.y > bounds[zoom][1][1]) {
        return null;
      }

      return ['https://www.gstatic.com/io2010maps/tiles/5/L2_',
          zoom, '_', coord.x, '_', coord.y, '.png'].join('');
    },
    tileSize: new google.maps.Size(256, 256)
  });
  angular.module('ngMap').run(function($rootScope) {
    $rootScope.imageMapType = imageMapType;
  });
</script>
</head>
<body>
  <ng-map zoom="18" center="37.78313383212, -122.4039494991302">
    <overlay-map-type object="imageMapType" init-method="push">
    </overlay-map-type>
  </ng-map>
</body>
</html>
